Structure L42341000+03001 · Richland County, MT

Main ST over Usbr Main Canal 051

Carries Main ST over Usbr Main Canal 051, East Edge Savage.

Overall conditionGood

Set by its lowest-rated component: Deck and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT60 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

60 ft end to end. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a tee-beam bridge.

Built199234 years old
Length60.0 ft18.3 m
Daily traffic132counted 2023
Last inspectedDecember 2024every 24 months

Location

StateMontana
CountyRichland
LocationEast Edge Savage
CarriesMain ST
CrossesUsbr Main Canal 051
Coordinates47.45214, -104.33838

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length60.0 ft (18.3 m)
Max Span57.1 ft (17.4 m)
Deck Width30.5 ft (9.3 m)
Deck Area170.2 sq m
Main Spans1
Year Built1992

Traffic

Avg Daily Traffic132 (2023)
Truck Traffic3%
Lanes On Bridge2

Inspection & Ownership

Last InspectionDecember 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure NumberL42341000+03001

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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